Re: [PATCH] uio/pdrv_genirq: Add OF support

[Michal Simek]

Grant Likely wrote:
> On Thu, Mar 31, 2011 at 02:30:00PM +0200, Michal Simek wrote:
> > Support OF support. "generic-uio" compatible property is used.
> >
> > Signed-off-by: Michal Simek <monstr@xxxxxxxxx>
> > ---
> >  drivers/uio/uio_pdrv_genirq.c |   60 ++++++++++++++++++++++++++++++++++++++--
> >  1 files changed, 57 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
> > index 7174d51..9e89806 100644
> > --- a/drivers/uio/uio_pdrv_genirq.c
> > +++ b/drivers/uio/uio_pdrv_genirq.c
> > @@ -23,6 +23,10 @@
> >  #include <linux/pm_runtime.h>
> >  #include <linux/slab.h>
> >  
> > +#include <linux/of.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/of_address.h>
> > +
> >  #define DRIVER_NAME "uio_pdrv_genirq"
> >  
> >  struct uio_pdrv_genirq_platdata {
> > @@ -92,11 +96,44 @@ static int uio_pdrv_genirq_irqcontrol(struct uio_info *dev_info, s32 irq_on)
> >  static int uio_pdrv_genirq_probe(struct platform_device *pdev)
> >  {
> >  	struct uio_info *uioinfo = pdev->dev.platform_data;
> > -	struct uio_pdrv_genirq_platdata *priv;
> > +	struct uio_pdrv_genirq_platdata *priv = NULL;
> >  	struct uio_mem *uiomem;
> >  	int ret = -EINVAL;
> >  	int i;
> >  
> > +	if (!uioinfo) {
> > +		struct resource r_irq; /* Interrupt resources */
> > +		int rc = 0;
> > +
> > +		rc = of_address_to_resource(pdev->dev.of_node, 0,
> > +							&pdev->resource[0]);
> > +		if (rc) {
> > +			dev_err(&pdev->dev, "invalid address\n");
> > +			goto bad2;
> > +		}
> > +		pdev->num_resources = 1;
>
> You shouldn't need this anymore.  Device tree sourced platform_devices
> get their resource table populated automatically.  Also, drivers
> should /never/ modify the resource values set in the device because it
> messes up driver rebinding.

done.

> > +
> > +		/* alloc uioinfo for one device */
> > +		uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
> > +		if (!uioinfo) {
> > +			ret = -ENOMEM;
> > +			dev_err(&pdev->dev, "unable to kmalloc\n");
> > +			goto bad2;
> > +		}
> > +		uioinfo->name = pdev->dev.of_node->name;
> > +		/* Use version for storing full IP name for identification */
> > +		uioinfo->version = pdev->dev.of_node->full_name;
>
> Comment on the binding: You should probably use the first entry in the
> compatible list for the name of the device.  Node names should be
> generic and usually they will say what a device does, but not what a
> device actually /is/ (this is the Generic Names recommended practice).
>
> Modern convention is to rely on the first compatible entry for
> describing what ip block it is.

Is it easy to way to find it out?

M


--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/